Sharpening attachment for clothcutting machines



A. P. KOMOW Feb. 13, 1940.

SHARPENING ATTACHMENT FOR CLOTH-CUTTING MACHINES Filed Feb. 1939 2 Sheets-Sheet l ATTORNEYS Feb. 13, 1940. A. P. KoMow 2,189,863

SHAR PENING ATTACHMENT FOR CLOTH-CUTTING MACHINES Filed Feb. 1, 1939 2 Sheets-Sheet 2 ATTORNEYS Patented Feb. 13, 1940 1 UNITED; AT

SHARPENING ATTACHMENT FOR oLoTn- J CUTTING MAonmEs e v H AlbertF. Komtw, New-20mm. Y. e Application February 1; 1939, Serial No. 253,989.

My invention relates to a new and improved sharpening attachment for cloth-cutting mw chines. l

. One of the objects of the invention is top roe t vide a simple attachment'which can be-readily applied to, and which can be removed from; a cloth-cutting machine ofthe type whichhas :a vertical straight-edge reciprocating knife.

Another object of the invention istoprovide a; device which will come into operative contact" with suitable'guide means,-before the grindingmeans contact with the knife.

Another object is to provide .an extremely sirnr ple device which willbe very reliable and "dura-e ble, and which can be made at low cost;

Other objects of my invention will be set fort in the following description and drawings which illustrate preferred embodiments thereof; it being understood that the above statement of the ob-l jects of my invention is intended generally t0- explain the same without limiting it in any manner. W. Fig. l is a side elevation, showing the-improved device applied to a conventional"cloth-cutting machine which has a verticallyreciprocating knife which has a straight-edge. [Part of the rep-r resentation oi the attachment has been broken away, in order to illustrate certain parts more clearly. r Y t t t.

Fig. 1A is tension thereof. 1 l l t Fig. 1B is a view similarto Fig. 1A, showing a portion of the second arm of the device and the lateral-extension thereof.

Fig; 1C is a top plan view of 'the: supplemental block which comprises one of the jaws of the device. l

Fig, 2 is a top plan view of-Fig. 1. r Fig; 3 is a sectional view on theline 3+ Fig.2. r Fig. 4is a top the open or inoperative position. I

Fig. 5 is a partial top plan view, showing'howj the device is operatively mounted ona suitable guide, while the grinding means are-spacedfromithe knife.

Figs; Band 7 are respectively sectional-' views on the lines 6- -6 and1''|wof-Fig."-2: v

The conventional cloth-i'cuttingmachine to which the device is applied;has-"the'usual knife I, and a holder z therefor. The drawings do not show the mechanism forreciprocating said knife I vertically, in adirection parallel to its vertical straight edge, assuch mechanism is well known.

a partial top plan view. of one ofthe arms of the device, showing the lateral 'exnot:

plan view of the attachment in- A.-v rtical rod 3 is suitably connected to the frame ot the v machine. The device comprises a first arm,4a,'and,asecond arm 4. Said arms 4d: and 4 resllectively have handhold portions 5a and5. A;;c ompression--spring 23 is suitably located between said arms4a and 4, so as tohold the parts normally in the position shown in Fig. 2. shown in Figs. 1A and 2, the first arm 4a is pro vided with an integral projection 6, which ex tendsinwardly and laterally. Thesecond arm 4' is provided with an integral inwardly and lat erally extending projection I la, which is integral with an upstanding block H, which is shaped so as'to provide a jaw 12. A supplemental block 8 is providedwith a second jaw 9. The block 8 is located at the top of the block I I;

aisasss Apivot pin'l8 turnably connectsthe-members 6, v

II and 8. This pivot pin I8 has an enlarged head at one end thereof. The other end of said pivot pin I8 is externally threadedand said end of.thepin I8 is screwed into the tappedbore 6d of themember 6. Said pin also passes through the'bore lid of the memberll A nut l9 holds the pivot pin, l8- to the member 6. r As shown in Fig. 2,'a spring 20, whichis preferably a blade spring, has :one end thereof connected to the arm 4a by means of a screw 22. Saidspring 20 has an upstanding portion which isconnected by means of ascrew 2| to the upstanding wall' of the member 8. Themember 8 is provided-with an extension H) which has a" recessed top wall, so asto provide a convenient rest for the thumb of the. operatonas shownin brokenlines. in Fig. 1. .The arm 4a is provided with an angular extension lb, to which a bracket IBisconnected-by a screw' zfi. Saidbracket l3, has an arm l3a. An emery wheel I! is turnably its end faces; .qSaid emery wheel Ila is; rigidly connected to abushing 28 by means ofa nut 24 which clamps the "emery wheelmll'aw and said washers, to a shoulder 'of s'aidibushing "28. v The bushing 28'isturnablyr-mounted on a stud l5, which has a threaded shank portion lfi. Longitudinal movement of the bushing 28, relative to the stud I5, is prevented by means of the usual nut-member 25, which is mounted upon the threaded shank portion l6. The frusto-conical wall of the nut-member 25 provides sufficient bearing surface for the bushing 28, so that the bushing 28 can turn freely relative to the member 25. The shank portion I6 is screwed into a tapped bore of the arm Ma of the bracket I4.

The jaws 9 and 12 are adapted to slidably engage the vertical depending rod 3, which is connected to the frame of the mechanism.

Since the member II can turn freely on the pivot pin l8, the spring 20 maintains the adjacent planar upstanding walls of the jaws 9 and l2 in abutting relation, when the device isin the closed position shown in Fig. 2. The spring 23 normally keeps the peripheries of the emery wheels l1 and Ila in close orin abutting relation. Referring to Fig. 2, spring 20 urges member 8 to turn clockwise fromits normalpositionposition shown in Fig. .5, before the adjacent abutting planar wallsof the jars 9q'and l2 are separated from each other. Therefore the emery wheels l1 and Na can be spaced substantially from'each other, as shownin Fig.- 5, before the jaws Sand 82 are separated.

'Upon further pressing the handhold 5 towards the handhold 5a, the spring 20 loses its stress and it holds member 8 against further turning movement, so that-the jaw I2 is then separated from the jaw 9, while the'member" 8 remains substantially in the 'same'position shown in Fig. 5.

In order to apply the jaws 9-and l2 slidably tothe rodx3, the member 4'is turned clockwise from the position shown in Fig. 5, until the jaws 9 and I2 separate sufficiently to-locat'e the rod 3 between said jaws. The 'spring'23 is then allowed to operate so-as-to force the jaw 12 towards the jaw 9." The jaw members 9 and I2 engage the rod 3, and the adjacent planar walls of said. jaws abut each other, before the emery wheels I1 and Ma contact with the knife. After.

the planar walls of jaws 9 and I2 have thus come into abutting position and after said jaws have thus slidably engaged the rod 3, theemery wheels are allowed'tocontactwith the knife while the member 8 is turned counterclockwise from the position shown in Fig. "5 to the positionshown inFig. 2.

The attachment can then be moved up and .down on the rod 3, while the emery wheels turn around axes which are'inclined to each other so asto grind the edge of the knife. 1

- Since the emery wheels cannot touch the knife until the jaws have slidably engaged the rod 3,

wards the opposed faces of the knife, said wheels contact simultaneously with the knife;

turning about The 'attachment is then prevented from the vertical axis of rod 3.

The invention. generally covers arms mounted for relative movement so that one of said arms can be moved relative to the other arm or both arms are movable relative to a common point, grinding or sharpening members connected to said arms, and jaw means movable relative to one or both of said arms. While one of the jaws (jaw I2) is rigidly connected to arm 4, the invention is now limited tosaid rigid connection.

Likewise, the invention is not limited to the pivotal connection between the arms. Numerous other changes and omissions could be made in the preferred embodiment illustrated herein, without departing from the spirit of. the invention. 7

The'sp-ring 20 turns the jaw member 8 only through a predetermined arc towards the other jaw member I I, when the sharpening devices are separated. A stop could be provided on pivot member 8 or the like, in order to limit the turning movement of jaw member 8.

I claim:

1.-A sharpening device comprising arms mounted for movement relative to each other, sharpening members connected to'said arms, jaw members mounted on said arms, said jaw members being shaped to contact slidably with an intermediate guide member, one of said jaw membersbeing movable relative to the respective arm, said'device having resilient means adapted to move said movable jaw member relative to the respective arm and towards the other jaw member through a predetermined distance, whereby said sharpening members can be moved away from each other before said jaw members are moved out of operative position;

. 2. A sharpening device comprising a first arm and a second arm, a pivot member turnably connecting said arms, sharpening members connected to said arms and movable in unison therewith, the first arm having a first jaw member rigid therewith, a second jaw member mounted turnably on said pivot member, a spring connected to the second arm and to the second jaw member and adaptedtoturn the second jaw member onsaid pivot througha predetermined arc and in the direction of the first jaw member, whereby the sharpening member can be separated a predetermined distance before said jaw members are moved out of relative operative positions, and said jaw members are moved out of said relative operative positions when said sharpening mem bers are additionally separated.

3. A sharpening device comprising a first arm and. a second arm, each arm having a sharpening member connected thereto, a pivot member turnablyconnectingsaid arms, jaw members mounted'for turning movement about the axis of said pivot member, one of said jaw members being connected to the first arm, the-other jaw member being turnable onsaid pivot member relative to both arms, means adapted to turn the second-mentioned jaw member towards the first jaw member through a limited predetermined are, so that the second-mentioned jaw member turns in unisonwith the first-mentioned jaw member through said limited are when the first arm is turned relative to the second arm to move said sharpening members away fromeach other and further turning, of the first arm then turns the firstementioned jaw member awayfrom'the second-mentioned jaw member;

- ALBERTP; KOMOW. 

